Evaluation of anticancer and antimicrobial activities of the Polygonum maritimum ethanol extract
Keywords:
P. maritimum, antifungal effect, synergism with doxorubicin, flow cytometry, antioxidant enzymesAbstract
Paper description:
- Polygonum plants possess different biological activities such as antioxidant, antimicrobial, anti-inflammatory, anticancer, antidiabetic and neuroprotective effects.
- To the best of our knowledge, the antifungal effect of the Polygonum maritimum ethanol extract has not been evaluated. We examined for the first time the potential of the extract to modulate the effect of doxorubicin on hepatoma cell viability, apoptosis and cell cycle arrest and expression of antioxidant enzymes.
- Our study provides new insight into the potential application of P. maritimum extract as a natural fungicide and as a potential adjuvant in chemotherapy against hepatocarcinoma.
Abstract: Polygonum maritimum is a traditional herbal remedy that produces abundant flavonoid secondary metabolites. The ethanol extract of P. maritimum aerial parts (POM) was chemically characterized and tested for antimicrobial properties and cytotoxicity. Results of LC-MS/MS analysis showed high contents of gallic acid, epigallocatechin gallate and catechin, and significant amounts of quercetin-3-O-galactoside and quercetin-3-O-glucoside. Evaluation of the antifungal properties revealed that POM induced notable growth inhibition of Alternaria alternata (34.3%), Penicillium spp. (30.6%), Fusarium semitectum (20.2%) and Aspergillus spp. (19.6%). Evaluation of cytotoxicity against human hepatoma HepG2 cells included monitoring the effects of both POM alone and its combination with cytostatic doxorubicin (Dox). Cell viability, apoptosis and cell cycle distribution and the expression of antioxidant enzymes (superoxide-dismutases SOD1 and SOD2 and catalase) were determined. A dose-dependent decrease in cell viability was detected, but a remarkably stronger effect was obtained when POM and Dox were applied in combination as compared to individual treatments. IC50 values were determined to be 393 μg/mL (POM) and 2.24 μg/mL (Dox) in combination, but 1153 μg/mL (POM) and 12.56 μg/mL (Dox) in a single treatment. The value of the Loewe index, determined for IC50,was notably lower than 1 (LI=0.51), clearly indicating synergism of POM and Dox. Additionally, POM and POM +Dox induced early/late apoptosis and G2/M cell cycle arrest. Furthermore, POM increased, while Dox decreased the expression levels of SODs and catalase. The obtained results encourage further examination of the potential use of POM in modern phytotherapy.
https://doi.org/10.2298/ABS180423028J
Received: April 23, 2018; Revised: June 6, 2018; Accepted: June 6, 2018; Published online: June 12, 2018
How to cite this article: Jovanović M, Srdić-Rajić T, Svirčev E, Jasnić N, Nikolić B, Bojić S, Stević T, Knežević-Vukčević J, Mitić-Ćulafić D. Evaluation of anticancer and antimicrobial activities of the Polygonum maritimum ethanol extract. Arch Biol Sci. 2018;70(4):665-73.
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